Posting to a Trend (Mac & iOS)

How do I post to a trend?

A Twitter trend isn't like a message board, it's basically a
search result. As people tweet, their tweets are added to all the
other tweets in Twitter's database - they aren't sorted into
topics. However, twitter clients, such as Twitterrific, can filter
tweets according to searches (trends) or other criteria.

If you want your tweet to show up in a specific trend, consider
adding a hashtag before your term. For instance many people
tweeting about the Iran election included "#iranelection" in their
tweet text. This allowed tweets about the event to show up whenever
someone searched for "iranelection". If you had wanted a tweet of
yours to show up in such a trend, you would simply include
"#iranelection" in the text of the tweet.